Related Experiment Video
Updated: Jun 23, 2026
Establishment of a Murine Pulp Exposure Model with a Novel Mouth-Gag for Pulpitis Research
Published on: October 27, 2023
A novel instrument to determine pulp proximity
David G Purton1, Nicholas P Chandler, Brian D Monteith
1david.purton@dent.otago.ac.nz
Abstract:
The aim was to determine whether extracted teeth could be used to test the Prepometer instrument, which indicates pulp proximity with green/amber/red light emitting diodes. Third molars were reduced to a plane in dentine and Prepometer readings made. Dentine was removed in 0.5 mm increments and readings made until only lights 9 or 10 (red) showed. The teeth were sectioned and the dentine thickness measured. Analysis permitted construction of a highly significant predictor-model (p < 0.01), the red/amber light boundary coinciding with a dentine thickness of 2.4 mm. The Prepometer was consistent in predicting pulp proximity but was more sensitive than specified.
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